I think the keyer is in pretty good shape now. I welcome any feedback on version 1.4 from anyone that may find it useful. Reminder that with the addition of proper low pass filters, this code functions as a full fledged CW transmitter for ham radio usage. Power output is approximately 5-7 mW putting it squarely in the QRP category. See my previous blog post for a simple amplifier to raise the output power sufficiently for beacon or CW operation.